Burn Notice's Better-Off Fed

Few actors are as well qualified to guest star as Carter, the alleged muscle for a Miami Beach loan shark (a slightly miscast Michael O'Keefe). As it turned out, Carter was inadvertently exposed as an undercover FBI agent by Michael (Jeffrey Donovan). Of course, Williams did time as corrupt corrections officer-turned-inmate Brad Bellick on Prison Break, so he knows a thing or two about crossing over the thin blue line...